/Engine/Source/Editor/UnrealEd/Public/Layers/LayersSubsystem.h
Appends all the actors associated with the specified layer.
void AppendActorsFromLayer ( const [FName](API\Runtime\Core\UObject\FName) & LayerName, [TArray](API\Runtime\Core\Containers\TArray)< [AActor](API\Runtime\Engine\GameFramework\AActor) * > & InOutActors ) const